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From Biology-Online Dictionary | Biology-Online Dictionary
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(biology) The act or means of moving molecules or ions across (cell membrane) or through (bloodstream)

(general) The movement (of something) from one place to another


To carry, move, or convey something from one location to another


In biology, transport refers to the act or the means by which a molecule or ion is moved across the cell membrane or via the bloodstream. There are two types of transport in this regard: (1) passive transport and (2) active transport. Passive transport is a kind of transport by which ions or molecules move along a concentration gradient, which means movement from an area of higher concentration to an area of lower concentration. Examples of passive transport include diffusion, filtration, and osmosis. Active transport is a kind of transport wherein ions or molecules move against a concentration gradient, which means movement in the direction opposite that of diffusion – or –movement from an area of lower concentration to an area of higher concentration. This type of transport requires expenditure of energy and the assistance of proteins (i.e. carrier protein).

Word origin: Middle English, Old French transporter (carry or convey across), Latin transporto, from trans- (across) + porto (to carry)

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